Is it just a matter of disconnecting that resistor? How much does the image quality improve? Do you have pictures of a monitor connected to the video port of a modded C64, before and after the mod? Thanks.

Thanks for the article – I have an NTSC C64c and read over this article and a few others. Took a chance and disconnected the L2 on the RF modulator, and saw a little bit of brightness and color return to the s-video signal (just a slight change, but noticable) and remove a little bit of the “noise” on the screen. Good stuff.